The letter labels closest to the points marked with a dot refer specifically to those points. The other letter labels refer to the region of the graph in which they lie.
The following diagram corresponds to a closed system, comprised of a pure substance.
The letter labels closest to the points marked with a dot refer specifically to those points. The other letter labels refer to the region of the graph in which they lie.
(See attached graph)
A) Match the following: (Assign a letter to each based off the graph)
gas, liquid and solid all may be present at equilibrium
normal gas region
critical point
solid region
normal melting point
normal gas and/or liquid present at equilibrium -- but no solid
supercritical fluid region
normal liquid region
gas and/or solid present at equilibrium -- but no liquid
B) For the substance represented by the above phase diagram, at any point at which the solid and liquid are in equilibrium, which phase is less dense?
Solid or liquid?
C) There is only one known pure substance which, as a liquid, cannot be frozen by cooling alone at 1 atm pressure. Which is it?
hydrogen (H2)
nitrogen (N2)
oxygen (O2)
helium (He)
water (H2O)
D) Which of the following substances cannot be liquified at 1 atm pressure?
nitrogen (N2)
oxygen (O2)
carbon dioxide (CO2)
hydrogen (H2)
water (H2O)
E) The pressure at point G: is atmospheric pressure.
can never be exceeded.
is called the critical pressure.
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